When it comes to the political systems of the world, there are a few main groups of countries. The first group is the USSR, which is a communist country that was in existence from 1922 to 1991. The second group is the European Union, which is a group of 25 countries that are all democracies. 

The European Union is a political organization that was founded in 1951. The Union has 27 member states, including the United Kingdom, France, and Spain. The goal of the Union is to create a single market and to promote democracy, prosperity, and peace. The Soviet Union was an authoritarian state that was founded in 1917. The Soviet Union had a single leader and the government-controlled all aspects of life. The Soviet Union was dissolved in 1991, and the Russian Federation was formed. The Russian Federation is a federal state with a president, a parliament, and a judiciary.

The two primary blocs of the international community are the Soviet Union and the European Union. The two blocs have a number of significant differences. 

The most obvious difference between the Soviet Union and the European Union is the size of each bloc. The Soviet Union was a much larger bloc than the European Union. The European Union has a population of over 50 million people, while the Soviet Union had a population of over 200 million people. Additionally, the European Union has a much more diverse population than the Soviet Union. The Soviet Union was dominated by Russian speakers, while the European Union has a population of many different languages.

Another major difference between the Soviet Union and the European Union is the economic structure of each bloc. The Soviet Union was a centrally planned economy, while the European Union is a market-based economy. The Soviet Union was unsuccessful in achieving economic stability, while the European Union has been successful in achieving economic stability.

The final major difference between the Soviet Union and the European Union is the political system of each bloc. The Soviet Union was a communist dictatorship, while the European Union is a democratic republic. The Soviet Union was an empire, while the European Union is a collection of countries with different political systems.